Hola sigo con el problema pero ahora me ha ocurrido otra cosa.
He decidido dejar el servidor encendido sin reiniciarse de momento y me acabo de encotrar con que el servicio de comparticion de archivos esta detenido y en zentyal.log me aparece el siguiente mensaje repetido todo el rato.
"2013/11/13 16:15:07 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (1 attempts)
2013/11/13 16:15:17 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (100 attempts)
2013/11/13 16:15:27 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (200 attempts)
2013/11/13 16:15:37 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (300 attempts)
2013/11/13 16:15:37 DEBUG> LDB.pm:201 EBox::LDB::safeConnect - FATAL: No es posible conectar con el servidor LDAP de samba: connect: Connection refused at /usr/share/perl5/EBox/LDB.pm line 201
EBox::LDB::safeConnect('EBox::LDB=HASH(0x3e96020)') called at /usr/share/perl5/EBox/LDB.pm line 155
EBox::LDB::connection('EBox::LDB=HASH(0x3e96020)') called at /usr/share/perl5/EBox/LDAPBase.pm line 95
EBox::LDAPBase::search('EBox::LDB=HASH(0x3e96020)', 'HASH(0x3e96b18)') called at /usr/share/perl5/EBox/LDB.pm line 272
EBox::LDB::domainSID('EBox::LDB=HASH(0x3e96020)') called at /usr/share/zentyal-samba/s4sync line 71
2013/11/13 16:16:08 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (1 attempts)
2013/11/13 16:16:18 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (100 attempts)
2013/11/13 16:16:28 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (200 attempts)
2013/11/13 16:16:38 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (300 attempts)
2013/11/13 16:16:39 DEBUG> LDB.pm:201 EBox::LDB::safeConnect - FATAL: No es posible conectar con el servidor LDAP de samba: connect: Connection refused at /usr/share/perl5/EBox/LDB.pm line 201
EBox::LDB::safeConnect('EBox::LDB=HASH(0x480e020)') called at /usr/share/perl5/EBox/LDB.pm line 155
EBox::LDB::connection('EBox::LDB=HASH(0x480e020)') called at /usr/share/perl5/EBox/LDAPBase.pm line 95
EBox::LDAPBase::search('EBox::LDB=HASH(0x480e020)', 'HASH(0x480eb18)') called at /usr/share/perl5/EBox/LDB.pm line 272
EBox::LDB::domainSID('EBox::LDB=HASH(0x480e020)') called at /usr/share/zentyal-samba/s4sync line 71
2013/11/13 16:17:10 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (1 attempts)
2013/11/13 16:17:19 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (100 attempts)
2013/11/13 16:17:30 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (200 attempts)
2013/11/13 16:17:40 WARN> LDB.pm:197 EBox::LDB::safeConnect - Could not connect to Samba LDB: connect: Connection refused, retrying. (300 attempts)
2013/11/13 16:17:40 DEBUG> LDB.pm:201 EBox::LDB::safeConnect - FATAL: No es posible conectar con el servidor LDAP de samba: connect: Connection refused at /usr/share/perl5/EBox/LDB.pm line 201
EBox::LDB::safeConnect('EBox::LDB=HASH(0x4f6ef60)') called at /usr/share/perl5/EBox/LDB.pm line 155
EBox::LDB::connection('EBox::LDB=HASH(0x4f6ef60)') called at /usr/share/perl5/EBox/LDAPBase.pm line 95
EBox::LDAPBase::search('EBox::LDB=HASH(0x4f6ef60)', 'HASH(0x4f6fa58)') called at /usr/share/perl5/EBox/LDB.pm line 272
EBox::LDB::domainSID('EBox::LDB=HASH(0x4f6ef60)') called at /usr/share/zentyal-samba/s4sync line 71"
En el dashboard he ido a la opcion de usuario y grupos y me aparece que no se puede a conectar a LDAP, he reiniciado el servicio de comparticion de archivos y ya funciona, pero sigo teniendo el problema que accedo a los recursos compartidos y abro los documentos muy lento hasta que no reinicio de nuevo la máquina.
El equipo no es muy potente que digamos, de procesador es un intel pentium G2030 a 3GHz doble nucleo y 4 GB RAM, pero solo somos dos usuarios los que estamos conectados.
Gracias por la ayuda.